[SRU][J][PATCH v2 07/20] x86/CPU/AMD: Call the spectral chicken in the Zen2 init function

[Juerg Haefliger]

From: "Borislav Petkov (AMD)" <bp at alien8.de>

No functional change.

Signed-off-by: Borislav Petkov (AMD) <bp at alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov at suse.com>
Link: http://lore.kernel.org/r/20231120104152.13740-6-bp@alien8.de
(cherry picked from commit cfbf4f992bfce1fa9f2f347a79cbbea0368e7971)
CVE-2024-53114
Signed-off-by: Juerg Haefliger <juerg.haefliger at canonical.com>
---
 arch/x86/kernel/cpu/amd.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 77c24e959d16..a9943c5950a5 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1071,10 +1071,8 @@ void init_spectral_chicken(struct cpuinfo_x86 *c)
 	 *
 	 * This suppresses speculation from the middle of a basic block, i.e. it
 	 * suppresses non-branch predictions.
-	 *
-	 * We use STIBP as a heuristic to filter out Zen2 from the rest of F17H
 	 */
-	if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && cpu_has(c, X86_FEATURE_AMD_STIBP)) {
+	if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
 		if (!rdmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, &value)) {
 			value |= MSR_ZEN2_SPECTRAL_CHICKEN_BIT;
 			wrmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, value);
@@ -1146,6 +1144,7 @@ static void zenbleed_check(struct cpuinfo_x86 *c)
 
 static void init_amd_zen2(struct cpuinfo_x86 *c)
 {
+	init_spectral_chicken(c);
 	fix_erratum_1386(c);
 }
 
@@ -1195,7 +1194,7 @@ static void init_amd(struct cpuinfo_x86 *c)
 	case 0x12: init_amd_ln(c); break;
 	case 0x15: init_amd_bd(c); break;
 	case 0x16: init_amd_jg(c); break;
-	case 0x17: init_spectral_chicken(c);
+	case 0x17:
 		   fallthrough;
 	case 0x19: init_amd_zn(c); break;
 	}
-- 
2.48.1